Dtc B1249 Double Locking Ecu Communication Stop

Power Source Network. Land Cruiser. Urj200, 202 Grj200 Vdj200
Networking. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CLEAR DTC

CHECK FOR DTC

CHECK HARNESS AND CONNECTOR (RELAY - MAIN BODY ECU, BATTERY AND BODY GROUND)

REPLACE DOUBLE LOCK DOOR CONTROL RELAY

CHECK FOR DTC

DTC B1249 Double Locking ECU Communication Stop


DESCRIPTION

DTC B1249 is stored when communication between the double lock door control relay and main body ECU (cowl side junction block LH) stops for more than 10 seconds.

DTC Code
DTC Detection Condition
Trouble Area
B1249
No communication from the double door lock relay for more than 10 seconds.
  1. Double lock door control relay
  2. Main body ECU (cowl side junction block LH)
  3. Harness or connector

WIRING DIAGRAM


Land Cruiser. Urj200, 202 Grj200 Vdj200.Networking.Lin Communication System. Dtc B1249 Double Locking Ecu Communication Stop


INSPECTION PROCEDURE

NOTICE:
When using the intelligent tester with the ignition switch off to troubleshoot:
Connect the intelligent tester to the vehicle, and turn a courtesy switch on and off at 1.5 second intervals until communication between the intelligent tester and vehicle begins.
HINT:
DTC B2325 is output when the communication between all of the following components and main body ECU (cowl side junction block LH) stops.
1.CLEAR DTC

  1. Clear the DTC (Click here).


NEXT


2.CHECK FOR DTC

  1. Recheck for DTC (Click here).

    Result:
    Result
    		Proceed to
    DTC B1249 is output
    		A
    DTC B1249 is not output
    		B


B
USE SIMULATION METHOD TO CHECK (Click here)
A


3.CHECK HARNESS AND CONNECTOR (RELAY - MAIN BODY ECU, BATTERY AND BODY GROUND)
Land Cruiser. Urj200, 202 Grj200 Vdj200.Networking.Lin Communication System. Dtc B1249 Double Locking Ecu Communication Stop

  1. Disconnect the E3 ECU connector.

  1. Disconnect the E86 relay connector.

  1. Measure the resistance according to the value(s) in the table below.

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    E86-9 (MPX1) - E3-10 (LIN2)
    		Always
    		Below 1 Ω
    E86-9 (MPX1) - Body ground
    		Always
    		10 kΩ or higher
    E3-10 (LIN2) - Body ground
    		Always
    		10 kΩ or higher
    E86-14 (GND) - Body ground
    		Always
    		Below 1 Ω

  1. Measure the voltage according to the value(s) in the table below.

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    E86-1 (+B) - Body ground
    		Always
    		11 to 14 V
    E86-7 (CPUB) - Body ground
    		Always
    		11 to 14 V


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.REPLACE DOUBLE LOCK DOOR CONTROL RELAY

  1. Temporarily replace the double lock door control relay with a new or normally functioning one (Click here)*1, (Click here)*2.

    HINT:
    1. *1: for LHD
    2. *2: for RHD

  1. Clear the DTC (Click here).


NEXT


5.CHECK FOR DTC

  1. Recheck for DTCs (Click here).

    Result
    Result
    		Proceed to
    DTC B1249 is not output
    		A
    DTC B1249 is output
    		B


B
REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)
A

END (DOUBLE LOCK DOOR CONTROL RELAY IS DEFECTIVE)